// SPDX-License-Identifier: GPL-3.0-or-later
// Copyright (c) 2025 XujueKing <leadbrand@me.com>

// SuperVM 2.0 - Range Proof Implementation
// 架构师: KING XU (CHINA)
// Phase 2.2.3: Range Proofs (Week 17-20)
//
// 实现 Bulletproofs Range Proofs
// 证明承诺的金额在 [0, 2^64) 范围内,而不泄露实际金额

use crate::privacy::types::*;
use anyhow::Result;

/// Range Proof Generator
/// 用于生成范围证明 (Bulletproofs)
pub struct RangeProofGenerator {
    // TODO: Phase 2.2.3 - 集成 bulletproofs 库
}

impl RangeProofGenerator {
    /// 创建新的生成器
    pub fn new() -> Self {
        todo!("Phase 2.2.3: Implement range proof generator")
    }
    
    /// 生成范围证明
    /// 
    /// # 参数
    /// - `amount`: 金额 (0 到 2^64-1)
    /// - `blinding_factor`: 致盲因子 (与 commitment 相同)
    /// - `max_bits`: 范围位数 (默认 64)
    /// 
    /// # 返回
    /// Range Proof 证明 amount ∈ [0, 2^max_bits)
    pub fn prove_range(
        &self,
        _amount: u64,
        _blinding_factor: &[u8; 32],
        _max_bits: usize,
    ) -> Result<RangeProof> {
        todo!("Phase 2.2.3: Implement Bulletproof range proof generation")
    }
    
    /// 批量生成多个范围证明 (性能优化)
    pub fn prove_range_batch(
        &self,
        _amounts: &[u64],
        _blinding_factors: &[[u8; 32]],
        _max_bits: usize,
    ) -> Result<Vec<RangeProof>> {
        todo!("Phase 2.2.3: Implement batch range proof generation")
    }
}

/// Range Proof Verifier
/// 用于验证范围证明
pub struct RangeProofVerifier {
    // TODO: Phase 2.2.3 - 添加验证逻辑
}

impl RangeProofVerifier {
    /// 创建新的验证器
    pub fn new() -> Self {
        todo!("Phase 2.2.3: Implement range proof verifier")
    }
    
    /// 验证范围证明
    /// 
    /// # 参数
    /// - `commitment`: Pedersen Commitment
    /// - `proof`: Range Proof
    /// 
    /// # 返回
    /// 验证是否通过
    pub fn verify_range(&self, _commitment: &Commitment, _proof: &RangeProof) -> Result<bool> {
        todo!("Phase 2.2.3: Implement range proof verification")
    }
    
    /// 批量验证多个范围证明 (性能优化)
    /// 
    /// Batch verification 可以显著提升性能
    /// 单个验证: ~10ms, 批量 10 个: ~30ms (平均 3ms/个)
    pub fn verify_range_batch(
        &self,
        _commitments: &[Commitment],
        _proofs: &[RangeProof],
    ) -> Result<bool> {
        todo!("Phase 2.2.3: Implement batch range proof verification")
    }
}

/// 估算范围证明大小 (bytes)
/// 
/// Bulletproofs size: ~700 bytes (64-bit range)
/// Aggregated (n outputs): ~700 + 32*log2(n) bytes
pub fn estimate_proof_size(_max_bits: usize, _num_outputs: usize) -> usize {
    todo!("Phase 2.2.3: Implement proof size estimation")
}

#[cfg(test)]
mod tests {
    use super::*;
    
    #[test]
    #[should_panic(expected = "not yet implemented")]
    fn test_range_proof_generator_placeholder() {
        let _generator = RangeProofGenerator::new();
    }
    
    #[test]
    #[should_panic(expected = "not yet implemented")]
    fn test_range_proof_verifier_placeholder() {
        let _verifier = RangeProofVerifier::new();
    }
}
